Diodes Incorporated AP7350D-18CF4-7

Overview

AP7350D-18CF4-7 from Diodes Incorporated is a 1.8V fixed-output, 150mA ultra-low quiescent current LDO regulator with active output discharge, housed in the X2-WLB0606-4 wafer-level chip-scale package. It delivers ±1% output voltage accuracy over temperature, supports 2.0V–5.25V input range, and draws only 0.25µA typical quiescent current - enabling multi-year battery life in compact wearable sensors and IoT edge nodes.

For engineers reviewing the AP7350D-18CF4-7 datasheet, AP7350D-18CF4-7 pinout, AP7350D-18CF4-7 application, or AP7350D-18CF4-7 equivalent, key selection criteria include its 0.33V dropout at 150mA (VOUT = 1.8V), EN-controlled shutdown with 0.02µA standby current, discharge resistor (~35Ω), and compatibility with 0.1µF ceramic input/output capacitors in space-constrained layouts.

Technical Context

The AP7350D integrates a precision voltage reference, error amplifier, current-limit circuit, and enable-controlled pass transistor in a single-stage LDO architecture. Its active output discharge path engages when EN is pulled low, rapidly discharging VOUT to GND via an internal ~35Ω switch - critical for sequencing-sensitive systems and preventing back-powering of upstream circuitry.

Designed for minimal board footprint and ultra-low power operation, it operates across –40°C to +85°C ambient, maintains stability with 0.1µF X5R/X7R ceramics, and features robust ESD protection (4kV HBM, 400V MM) and latch-up immunity (>400mA). The X2-WLB0606-4 package uses SnAgCu solder balls and has θJA = 267°C/W.

Key Specifications

Pinout & Package

The AP7350D-18CF4-7 is packaged in the X2-WLB0606-4 wafer-level chip-scale package (0.64mm × 0.64mm × 0.23mm), featuring SnAgCu solder balls and moisture sensitivity level 1 (J-STD-020).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LDO regulator applications.

Compared with MCP1700-1802E/TO and XC6210B182MR-G, the AP7350D-18CF4-7 uniquely combines wafer-level miniaturization, sub-µA quiescent current, and integrated discharge - delivering superior power efficiency, layout simplicity, and system-level reliability in space- and energy-constrained designs.

Availability

AP7350D-18CF4-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, wireless communication modules, and other battery-operated devices requiring stable component supply and long operational lifetime.

Supply support for AP7350D-18CF4-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7350 series targets ultra-low-power, space-constrained applications - specifically engineered to replace legacy LDOs in wearables, medical patches, and battery-powered edge sensors where IQ, footprint, and discharge capability are decisive.

FAQ

What is the minimum input voltage required for AP7350D-18CF4-7 to maintain regulation at 150mA load?

The minimum input voltage is determined by dropout: V_IN(MIN) = V_OUT + V_DROPOUT. At 150mA and 1.8V output, max dropout is 0.90V (per datasheet), so V_IN(MIN) = 2.7V. However, typical dropout is 0.33V, allowing stable operation down to 2.13V - verified across –40°C to +85°C with proper 0.1µF ceramic capacitors.

Can AP7350D-18CF4-7 be used without an external output capacitor?

No. An output capacitor (C_OUT) is mandatory for stability and transient response. The datasheet specifies minimum 0.1µF X5R/X7R ceramic capacitance placed adjacent to VOUT and GND pins. Omitting C_OUT causes oscillation, poor load regulation, and potential damage under dynamic load conditions.

How does the active discharge feature behave during EN deactivation?

When EN is driven low, the internal ~35Ω discharge path connects VOUT directly to GND, discharging a 1µF load in <10µs. This prevents residual voltage from powering downstream logic or causing sequencing conflicts. Discharge activates only after the main pass transistor turns off and remains active until VOUT reaches ~0.1V.

Is AP7350D-18CF4-7 qualified for automotive applications?

No. While the AP7350D-18CF4-7 meets industrial temperature range (–40°C to +85°C), it is not AEC-Q100 qualified. Diodes Incorporated offers automotive-grade variants (e.g., AP7350Q series) with PPAP support, IATF 16949 manufacturing, and extended qualification testing - contact Diodes sales for those part numbers.